Which of the following statements is (are) TRUE, assuming the firm is choosing the optimal bundle of inputs that minimizes the cost of producing a given quantity of output?
I. The marginal product per dollar spent on labor equals the marginal product per dollar spent on capital.
II. APL = APK
III. 
IV. MPL × W = MPK × R
Definitions:
Gross Margin
A company's total sales revenue minus its cost of goods sold (COGS), divided by total sales revenue, expressed as a percentage.
Fixed Costs
Expenses that do not change with the level of goods or services produced by a business, such as rent, salaries, and insurance premiums.
Sales Increase
A rise in the number of products or services sold, often indicating a growth in a company's business activities and revenue.
Risk/Reward Tolerance
An individual's or entity’s capacity to assume risk with the expectation of receiving a corresponding return, balancing between potential gains and losses.
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